/*
 * Base64.cpp
 *
 *  Created on: Sep 1, 2012
 *      Author: jevey
 */

#include "Base64.h"

#include <iostream>
namespace IHOME
{

Base64::Base64()
{


}

Base64::~Base64()
{

}

#define BASE_STRING "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

static const std::string base64_chars = BASE_STRING;


static inline bool is_base64(unsigned char c)
{
        return (isalnum(c) || (c == '+') || (c == '/'));
}

std::string Base64::Encode(const char * bytes_to_encode, unsigned int in_len)
{
        std::string ret;
        int i = 0;
        int j = 0;
        unsigned char char_array_3[3];
        unsigned char char_array_4[4];

        while (in_len--) {
                char_array_3[i++] = *(bytes_to_encode++);
                if (i == 3) {
                        char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
                        char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
                        char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
                        char_array_4[3] = char_array_3[2] & 0x3f;

                        for(i = 0; (i <4) ; i++)
                                ret += base64_chars[char_array_4[i]];
                        i = 0;
                }
        }

        if (i) {
                for(j = i; j < 3; j++)
                        char_array_3[j] = '\0';

                char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
                char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
                char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
                char_array_4[3] = char_array_3[2] & 0x3f;

                for (j = 0; (j < i + 1); j++)
                        ret += base64_chars[char_array_4[j]];

                while((i++ < 3))
                        ret += '=';

        }

        return ret;

}

std::string Base64::Decode(std::string const& encoded_string)
{
        int in_len = encoded_string.size();
        int i = 0;
        int j = 0;
        int in_ = 0;
        unsigned char char_array_4[4], char_array_3[3];
        std::string ret;

        while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
                char_array_4[i++] = encoded_string[in_]; in_++;
                if (i ==4) {
                        for (i = 0; i <4; i++)
                                char_array_4[i] = base64_chars.find(char_array_4[i]);

                        char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
                        char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
                        char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

                        for (i = 0; (i < 3); i++)
                                ret += char_array_3[i];
                        i = 0;
                }
        }

        if (i) {
                for (j = i; j <4; j++)
                        char_array_4[j] = 0;

                for (j = 0; j <4; j++)
                        char_array_4[j] = base64_chars.find(char_array_4[j]);

                char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
                char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
                char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

                for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
        }

        return ret;
}
} /* namespace IHOME */
